Snapshot (nightly) builds for all active releases are published to the Apache snapshot repository.

Version 1.2.x, 1.3.x, 2.0.x, 2.1.x, 2.2.x, 2.2.1.x, 2.3.x, and trunk (2.4.x as of this writing)
can be found in the snapshot repository on repository.apache.org. A maven
project can access this snapshot repository by adding the following
repository in pom.xml: